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PUL-E ALAM, AFGHANISTAN - MARCH 27: U.S. Army SPC Romik Hazarian escorts U.S. Army advisers with 2nd Battalion 87th Infantry Regiment, 3rd Brigade, 10th Mountain Division inside Forward Operating Base (FOB) Maiwand, an Afghan National Army (ANA) base that adjoins the U.S. Army's FOB Shank, on March 27, 2014 near Pul-e Alam, Afghanistan. Soldiers with the U.S. Army's 3rd Brigade Combat Team, 10th Mountain Division stationed at FOB Shank advise and assist Afghan National Security Forces in the region. Security is at a heightened state throughout Afghanistan as the nation prepares for the April 5th presidential election. (Photo by Scott Olson/Getty Images)
PUL-E ALAM, AFGHANISTAN - MARCH 27: U.S. Army SPC Romik Hazarian escorts U.S. Army advisers with 2nd Battalion 87th Infantry Regiment, 3rd Brigade, 10th Mountain Division inside Forward Operating Base (FOB) Maiwand, an Afghan National Army (ANA) base that adjoins the U.S. Army's FOB Shank, on March 27, 2014 near Pul-e Alam, Afghanistan. Soldiers with the U.S. Army's 3rd Brigade Combat Team, 10th Mountain Division stationed at FOB Shank advise and assist Afghan National Security Forces in the region. Security is at a heightened state throughout Afghanistan as the nation prepares for the April 5th presidential election. (Photo by Scott Olson/Getty Images)

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U.S. aircraft supports Afghan troops battling to retake a key city that's fallen to Taliban fighters. CNN's Barbara Starr reports